/*

   Copyright 2001  The Apache Software Foundation 

   Licensed under the Apache License, Version 2.0 (the "License");
   you may not use this file except in compliance with the License.
   You may obtain a copy of the License at

       http://www.apache.org/licenses/LICENSE-2.0

   Unless required by applicable law or agreed to in writing, software
   distributed under the License is distributed on an "AS IS" BASIS,
   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   See the License for the specific language governing permissions and
   limitations under the License.

*/

package org.apache.batik.transcoder.wmf.tosvg;

import java.io.DataInputStream;
import java.io.IOException;
import java.net.URL;
import java.util.Vector;

import org.apache.batik.transcoder.wmf.WMFConstants;

/**
 * An object that stores the vector graphics records.
 *
 * @author <a href="mailto:luano@asd.ie">Luan O'Carroll</a>
 * @version $Id$
 */
public class RecordStore {

    public RecordStore(){
        reset();
    }

    /**
     * Resets the internal storage and viewport coordinates.
     */
    public void reset(){
        numRecords = 0;
        vpX = 0;
        vpY = 0;
        vpW = 1000;
        vpH = 1000;
        numObjects = 0;
        records = new Vector( 20, 20 );
        objectVector = new Vector();
    }

    synchronized void setReading( boolean state ){
        bReading = state;
    }

    synchronized boolean isReading(){
        return bReading;
    }

    /**
     * Reads the Wmf file from the specified Stream.
     * A Wmf file can be produced using the GConvert utility found at
     * http://www.asd.ie/Wmf.htm
     *
     * The Wmf format is slightly more compact than the original WMF format and
     * in some cases may produce better handling of colours.
     */
    public boolean read( DataInputStream is ) throws IOException{
        setReading( true );
        reset();

        int functionId = 0;
        numRecords = 0;

        numObjects = is.readShort();
        objectVector.ensureCapacity( numObjects );
        for ( int i = 0; i < numObjects; i++ ) {
            objectVector.addElement( new GdiObject( i, false ));
        }

        while ( functionId != -1 ) {
            functionId = is.readShort();
            if ( functionId == -1 ){
                break;
            }

            MetaRecord mr;
            switch ( functionId ) {
            case WMFConstants.META_TEXTOUT:
            case WMFConstants.META_DRAWTEXT:
            case WMFConstants.META_EXTTEXTOUT:
            case WMFConstants.META_CREATEFONTINDIRECT:{
                short len = is.readShort();
                byte[] b = new byte[ len ];
                for ( int i = 0; i < len; i++ ) {
                    b[ i ] = is.readByte();
                }
                String str = new String( b );
                mr = new MetaRecord.StringRecord( str );
            }
            break;

            default:
                mr = new MetaRecord();
                break;
            }

            int numPts = is.readShort();
            mr.numPoints = numPts;
            mr.functionId = functionId;

            for ( int j = 0; j < numPts; j++ ){
                mr.AddElement( new Integer( is.readShort()));
            }

            records.addElement( mr );

            numRecords++;
        }

        setReading( false );
        return true;
    }

    /**
     * Adds a GdiObject to the internal handle table.
     * Adds the object at the next free location.
     *
     * This function should not normally be called by an application.
     */
    public void addObject( int type, Object obj )
    {
        for ( int i = 0; i < numObjects; i++ ) {
            GdiObject gdi = (GdiObject)objectVector.elementAt( i );
            if ( gdi.used == false ) {
                gdi.Setup( type, obj );
                lastObjectIdx = i;
                break;
            }
        }
    }

    /**
     * Adds a GdiObject to the internal handle table.
     * Wmf files specify the index as given in EMF records such as
     * EMRCREATEPENINDIRECT whereas WMF files always use 0.
     *
     * This function should not normally be called by an application.
     */
    public void addObjectAt( int type, Object obj, int idx ) {
        if (( idx == 0 ) || ( idx > numObjects )) {
            addObject( type, obj );
            return;
        }
        lastObjectIdx = idx;
        for ( int i = 0; i < numObjects; i++ ) {
            GdiObject gdi = (GdiObject)objectVector.elementAt( i );
            if ( i == idx ) {
                gdi.Setup( type, obj );
                break;
            }
        }
    }

    /**
     * Returns the current URL
     */
    public URL getUrl() {
        return url;
    }

    /**
     * Sets the current URL
     */
    public void setUrl( URL newUrl) {
        url = newUrl;
    }

    /**
     * Returns a GdiObject from the handle table
     */
    public GdiObject getObject( int idx ) {
        return (GdiObject)objectVector.elementAt( idx );
    }

    /**
     * Returns a meta record.
     */
    public MetaRecord getRecord( int idx ) {
        return (MetaRecord)records.elementAt( idx );
    }

    /**
     * Returns a number of records in the image
     */
    public int getNumRecords() {
        return numRecords;
    }

    /**
     * Returns the number of GdiObjects in the handle table
     */
    public int getNumObjects() {
        return numObjects;
    }

    /**
     * Returns the viewport x origin
     */
    public int getVpX() {
        return vpX;
    }

    /**
     * Returns the viewport y origin
     */
    public int getVpY() {
        return vpY;
    }

    /**
     * Returns the viewport width
     */
    public int getVpW() {
        return vpW;
    }

    /**
     * Returns the viewport height
     */
    public int getVpH() {
        return vpH;
    }

    /**
     * Sets the viewport x origin
     */
    public void setVpX( int newValue ) {
        vpX = newValue;
    }

    /**
     * Sets the viewport y origin
     */
    public void setVpY( int newValue ) {
        vpY = newValue;
    }

    /**
     * Sets the viewport width
     */
    public void setVpW( int newValue ) {
        vpW = newValue;
    }

    /**
     * Sets the viewport height
     */
    public void setVpH( int newValue ) {
        vpH = newValue;
    }

    transient private URL url;

    transient protected int numRecords;
    transient protected int numObjects;
    transient public int lastObjectIdx;
    transient protected int vpX, vpY, vpW, vpH;
    transient protected Vector	records;
    transient protected Vector	objectVector;

    transient protected boolean bReading = false;
}
